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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2dd7aebc28cbe61e3f78307ca6ded7e49559d3fe88d1660197b2fb651d994c2' 
  AND token = 'Cnge05QZGDnjHRY3Bf6SJkOXmXdCQMME0sETQvU0fqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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