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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b0fdd3d5008cbcc7c0e0d02f31f4a9ac8d868fe506bf782f15efe34ef8331f' 
  AND token = '60EebGhn/mLJyapUZ3v8vEeM/nE417B2iM+Sqm+OtuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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