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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f642173ad8086142936ccfb9edadb22c2a236f8c3851b5243805ba78a90813d' 
  AND token = 'HktSNn4tTN6vdDGl3mpm6cE+uaFb2uV8TBYYtr3dhTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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