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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7617007b1a6849d519c021073b71e4b812d2026eb41f23235b35f3dab011dd' 
  AND token = 'Tom46vWkgcYLPfMVFsrgor8/vnADCqPzdx8wLY53qfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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