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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc921088e15fa96230fcc829cb849dcf45b8665c260e29fac2c78e7ffda8b7ed' 
  AND token = 'sM+scb2vYSVgENx7Gub96Nc7YB+Q+2aW08V4NdcpPUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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