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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1008df95f9e79ad94a010006f5a231f2fb3e392c0b2efb66be8e3d751949dd8' 
  AND token = '2B1rpBYaB3DG77S1Fb/V2SGHyaVFq/LSLFMfAQWNMS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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