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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b93dbd906f9b10a0830c6aae75bf37ac00d3d260603b992ea59bc41a956d1e5' 
  AND token = 'RViv2lpTD2VqjxMX271E636VTpICfMEY2mNEA21kZA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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