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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90420b1b314a1e87ed92738ba514c7ead3535b7c007643a6bd6f9ab9d3baf69c' 
  AND token = 'Qv0nW6YkC1eXlTIl8uSHr5xM4qU+dKpK5YCTIkov90Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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