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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f3133185ba36df44113163e2783477353c6807677f6e25095f0042909122e38' 
  AND token = 'Y+iHhJZXANSeQ1BAAhH2xyN5KKh52FgcJuyhEEEoTd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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