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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a62a9039bae1aa150b7b94a025dde23f972bb65800c940b73921841dd7a675f' 
  AND token = '+8Um6RpecmpP6yKuR1rQyZPq626V4ldtLkMcX/vmXzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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