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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9cfd0f087dbc7e90e84c99c3954b8f94467c839d98767cd5e58b14fa4d0a62' 
  AND token = 'pQkJvK9B2Me5bKQSGFtBihp+D0e7KRM6QFymMtq30fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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