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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82584f1986f37f121a39ef16c2e82620c7be3f3712707d70295cc183b550953' 
  AND token = 'DhMP/IXPV7HzgrsITV/4Q9dZEOsLLkdA0LNr9Ak/pko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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