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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a546095afddb92cab82685c3a18806e83d0c69be14af79c704f6f1061636cbb9' 
  AND token = 'DfXAgnStpgF9GXnTmQYp05NrBc8CBwmd9Hskp+YzjKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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