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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e0929d1d8c9e00af17e3a8ceffc939438bceba3c629aba798fd5c7141bf312' 
  AND token = 'oKNAZYECMf+ELLKbnM1C5ue0e/zkXg0BpI//VQYNHBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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