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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da2858c22992a2f12b831fcbbb6470bb8c194411c3068d679db651724d699c4' 
  AND token = 'b48wBi+w/a+9+SXXUN3VSktC1pi7ig8QjQXMfQrDr30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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