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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c31f5c0a8c6d187d8df98c4ab3ee296105df24a8ca9935d0fc5c7156afaa12' 
  AND token = '8X0ihvbASDx8x32Pg7jW1Uk/ObbsikKs6PdTqTqQmFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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