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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca0e750c37075d8140490a11a6305a0efa30a7128b049118f3fda1aba92555c' 
  AND token = 'tKC09fcUEovEn/iIj3G/trf7/okBairH/ZzAtEfcrKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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