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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c9d4c300cbd1850999f484e853d729cb610c9446b13500be97e30b9893d166' 
  AND token = '3UrllWfU7GSND1ekPf44HyS2qXaU0uwBRhA/1F5l/8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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