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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '784d93c04ecf0a6ccd6c67673494f7e0647b310cb94345bca6019c81aa3e7f06' 
  AND token = 'ubUJ8X39RpHp61SU2G7LF06vpm2DRAN4iMg0qbknBB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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