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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616c6f915fd5d547e9da130eeb7942e7077f43323022d1033dda932dd34e70ff' 
  AND token = 'sueUJ3N2xq5I28+o3JU4//PpTR3j3KxApfhF0KeU71A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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