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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372d142f687e2fa5e40618ab3e1841ff53d32ba29edcf2d40099583f6aa0d72a' 
  AND token = 'MivxSck/SjewSI/fJ5cIpoczTx/Nz8M8avB061DKg/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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