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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71ecb4f306b8c89603c0008219d7dbf93e2a623be52c27b8903a6fa2fb48387' 
  AND token = 'hhoy2JyXp25Ghx7wK5KTkJlo9GE4aKIzxg3hJsNQt1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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