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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92beaf18ea5f7a93d68be871935c7c0b0b3136871019676e2f85cd3759866d14' 
  AND token = 'c+CfV16fQVHsmd3VCiQrtW+SdE8/ZpWXHSqep15b2gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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