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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cdf5228bb6324f73916058c2e1af728e6ceae19e1a4ff2d5056ed4f35473d2c' 
  AND token = 'hHqyA9Lmssi30BW7oW5lyswEDzOERjC9RcMeuYIxpJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}