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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f6415dcbd03d86bd6d5782f24ca3dd01e9233393a6583009f1d05f792b1226' 
  AND token = 'AeODRIkgprn1uLGjCCnF5XeIwHO14m4+wGXxBtCSErk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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