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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df7082829ff6da29f9062f2dc72cb926aae99345b0ded14443fe11b45c4c3502' 
  AND token = 'YPavk+v6wLYMfkvRIcdifJVpXG26YOxSf+2b3+yUNvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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