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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f378cfaf6cf121630c0e4a4564b1a4a8f0b2e2272039cb0e762ea4351badaf' 
  AND token = 'MZbf0Ktc7ivgX7vARd33sH+db8H5Rz30nnROv8folfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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