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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b011f8900b14f9464044585aa3fec6588437fcbb272c10c3fb4941080b2388aa' 
  AND token = 'cC1uJJhQiGcVXou01+oCQ/D/nRkZCkWJDb/cpcZKSSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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