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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bebd11ba3d91603964a711cb3aa762b13c82d28b10fdd94c4099d37e3159338c' 
  AND token = 'dNVm/RhQOfMn2mp6rc6fTcTQk8kWnG+JS5PNAWj3tfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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