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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e7a18e3e66c23d72ec7bd31346e61529827c33f14f13820ec8723a17557548' 
  AND token = '/CkLRgStxu2HiOyjvzvWMyxkfiSiRXus2icoIWj1Ax8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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