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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635cc98cc84fc63813b8ee3a731203725e578eafa8d80e8630325ed35a4ad816' 
  AND token = '7Gf7lI2DBE51qEcaG0D49SoE1765smLKxppEsd6b9T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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