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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '121b65ad55ba992eb10928b2b3e4b42179b0dfcd22d1e0fc1ca1cbd4a58320a6' 
  AND token = 'sPkcv6qPkiR0wUwz6b76BRjMG1rs5yefOKUkIbPXA2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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