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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '184d22b043b5846402fbf5d68189bf106f440f9a6e2158a47a41469dc0584674' 
  AND token = 'FzZGsUccW927NkYFl8guJ/hcSLiLJgtBByOuv0Me/W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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