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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '675e2c4603d9036aef79d5ecda4a26f686f5c87644ac0b59fee900faa9b115ef' 
  AND token = 'riISBVHMl4BzZUOQ6xaZQ+v/8NL3mFwHVCr0dk4inUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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