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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e538629ec4f76f63e24c2445d3ec2391ee6b3cbb0ad69703f84745686630c0e0' 
  AND token = '0xeXbw+rF5q9umxsnuZVspCzHNCemRmns6k1EBNkjvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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